Chemistry Practice Question Preview (ID: 31386)


Chemistry Practice. TEACHERS: click here for quick copy question ID numbers.

Which of the following is an example of a physical change?
a) metal on a car rusting
b) Jamesray burning a couch after the panthers win the super bowl
c) Mrs. Hoover holding an ice cube in her hand and it melting
d) all the above

which of teh following is an example of a chemical change?
a) Rose cutting and changing her hair color to purple
b) Cody setting off a bomb in Mrs. Hoover's class
c) Butter melting on the table
d) all the above

Which of the following correctly describes a chemical change?
a) It is when it can change color
b) It is when it can change but is the same thing you started with
c) It is when it can change shape
d) It is when it changes and you get a totally new substance

Which of the following correctly describes a physical change?
a) It is when it releases a gas
b) It is when it can change but is the same thing you started with
c) It is when it gives off energy
d) It is when it changes and you get a totally new substance

What is the best example of a pure substance?
a) peanuts
b) gold
c) milk
d) carbon dioxide

Which best explains why the total mass of the products would be less than the total weight of the reactants after a chemical reaction?
a) a physical change occurred
b) atoms involved in the reaction lost mass
c) particles were created in the new solution
d) gases were released into the atomosphere

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon, how many atoms of carbon should be in the products?
a) 12 atoms of carbon
b) 6 atoms of carbon
c) 3 atoms of carbon
d) 2 atoms of carbon

Which of the following shows one example of a chemical change and one example of a physical change?
a) boiling water and melting wax
b) rusting iron and baking a cake
c) dissolving powder and shredding paper
d) freezing water and burning coal

How does a balanced chemical equation satisfy the Law of Conservation of Mass?
a) during a chemical reaction, the total amount of matter stays the same
b) during a chemical reaction, matter is destroyed
c) during a chemical reaction, one or more substances are formed
d) during a chemical reaction, the total number of atoms increases

If I wanted to speed up a chemical reaction, which of the following would I use?
a) inhibitor
b) endothermic reaction
c) catalyst
d) exothermic reaction

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